Optical Instruments

A. spectrometer
B. galvanometer
C. interferometer
D. none of these

A. Newton
B. Einstein
C. Raleigh
D. Planks

A. object is beyond C
B. if the object is with in C
C. if the object is within f
D. both B and C

A. C = 4fd
B. C = 8fd
C. C = 16fd
D. C = 5/2fd

A. 300km
B. 200km
C. 100km
D. 20km

A. to produce parallel beams of light
B. to filter the light rays
C. to make them
D. no function

A. Multimode index fiber
B. Graded index fiber
C. Single mode step index fiber
D. Copper wire

A. fo+fe
B. fo/fe
C. fe/fo
D. (1+fo/fe)L/fo

A. Diodes
B. Repeaters
C. Laser
D. Transformer

A. 42°
B. 47°
C. 52°
D. 50°